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US Patent 4681518 - Single-acting, gas operated pump

US Patent Issued on July 21, 1987
Estimated Patent Expiration Date: Icon_subject December 20, 2005Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
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Abstract

A single-acting, gas operated, pump method and apparatus including a pump body having a main chamber divided by a reciprocating piston assembly into a gas driving chamber and a liquid pumping chamber, a spring for biasing the piston assembly into one of its two end positions, a reciprocating control valve controlling the flow of driving gas to and from the gas driving chamber, a snap-acting spring mechanically coupling the control valve to the reciprocating movement of the piston assembly, and a counteracting spring for biasing the control valve toward one of its two positions.

Inventor

Assignee

Application

No. 06/811863 filed on 12/20/1985

US Classes:

417/395, Diaphragm91/347Coil spring moves laterally relative to coil axis

Field of Search

417/393With additional unitary common pumping and motor working member

Examiners

Primary: Smith, Leonard E.

US Patent References

603242, 1067613, 2028371, 2090575, 2214922, 2506434, 2658485, 2711134, 2780177, 3000320, 3294030, 3299826, 3387566, 3771907, 3816034, 4334838, Diaphragm type fluid pump having a flexible diaphragm with an internal reinforcing plate
Issued on: 06/15/1982
Inventor: Fessler ,   et al.
4436493Self contained pump and reversing mechanism therefor
Issued on: 03/13/1984
Inventor: Credle, Jr.

International Classes

F04B 9/127 (20060101)
F01L 35/00 (20060101)
F04B 9/00 (20060101)

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